Fig. 2

Cellular uptake of coumarin 6-LPN on HEI-OC1 cells. a confocol images of internalization at different times. b Flow cytometry assay. c Mean fluorescence intensity of HEI-OC1 cells by flow cytometry assay. ***p < 0.001 as compared with 0 h, ^###p < 0.001 as compared with 1 h, ^$$$p < 0.001 as compared with 3 h